transistor switch

John Bardeen, Walter Houser Brattain, and William Bradford Shockley won the Nobel Prize for inventing the transistor, and it’s the invention which has made many of the major achievements of technology in the late 20th century possible.  ENIAC occupied a room the size of a gym at Penn, now I’ve got more computing power in my digital watch.
 
A transistor makes a fair switch (as seen here) and also can be used as an amplifier, but I’ll get to trying that out later.

see that motor run?  Mr. Zip would approve!

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